Conduit.



No. 695,594. Patented Mar. I8, |1902.

V; H.'YARNALL.

CONDUIT.

(Application med Dee.' 1o; 1901.)

(No Model.)

TNE Nonnls Firms oo.. PHoTauma. wAsHjNGYoN. D. c.

' -4 UNITED STATES PATENT OFFICE.

VERNON H. YARNALL, OE NEW YORK, N. Y.

CONDUlT.

SPECIFICATION forming part of Letters Patent No. 695,594, dated March18, 1902.

Application led December 10, 1901. Serial No. 85,341. (No modelo To allwhom t may concern:

Be it known that I, VERNON H. YARNALL, a citizen of the United States,residing in the borough of Manhattan, city of New York, State of NewYork, have invented a certain new and usefullmprovement in Conduits, ofwhich the following is a description.

The object of my invention is to produce a clay conduit for electricconductors which will afford a better protection for the cables, thesections of which conduit can be maintained in alinement and which willalso be well adapted for the junction of conduits of a greater and lessnumber 'of Vducts and at different angles,while preserving thesubstantial continuity of the surfaces of the ducts at the joints of thesections.

In the aecompanyingdrawings, Figure 1 is a perspective view showing oneend of a fourduct conduit-sectionwith one of the aliningkeys inposition. Fig. 2 is a side elevation showing the joining of two two-ductconduits with a four-duct conduit and thechanging of the angle of one ofthe smaller conduits, the ends of the conduits being shown cut Off at anangle to illustrate the partitions. Fig. 3 is an edge view of oneof thealiniug-keys.

Figs. 4, 5, and 6 are end views of conduit-sec# tions having,respectively, two, three, and six ducts, the location of keys in boththe vertical and horizontal key-spaces being show in Fig. 6. j j

A is the clay conduitsection, prefer ly of general rectangular form andcontaining two or more ducts B. The intervening partitions b etween theducts are formed of two longitudinal walls a b, having an `intermediaterectangular air-space c, and in the case of a conduit-section havingfour or more ducts in dierent horizontal and vertical planes thecrossing walls of the intervening partitions are also separated by acentral opening d. The width of an intervening partition, in`

cluding the two Walls and the intermediate space, is the width of two ofthe outer walls of the conduit or slightly Wider, so that in joiningsections having a smaller'numberl of ducts with a section having alarger number of ducts, as illustrated in Fig. 2, the substantialcontinuity of the surfacesof the ducts can be maintained at the joints.

The provision of .intervening partitions made of two walls and anintermediate space is advantageous, not only for the reason juststatedbut for the further reason that the cables in one duct are betterprotected against injury from the burning out of a cable rin au Width otthe separation between the ducts and also the presence of theintermediateair-I space, and, still further, by the making of adjoiningduct on' account' of the additional these partitions with double wallsand an intermediate air-space a uniform shrinkage in firing the clay issecured, which would not be the case it the partitions were solid andhad the entire thickness ofv the two walls and the intermediate airspaee.- The oblong airspaees in the partitions separating the ducts ofthe conduit also permit the vemployment of keys C, having anoblongcross-section, which may be provided with Ispacing-pins"e and which areinserted in these air-spaces of the adjoining sections of the conduitand serve to keep the sections in alinement. One

or more of these keys will be employed at each joint, preferably two ormore where thev conduit-sections have two or more of such spaces, and inthe case of a four-duct or sixduct conduit having ducts in differenthorizontal andvertical planes keys are preferably inserted both in oneor more of the horizontal intermediate air-spaces and iu one or ratingthe ducts. and the iiat keys till these spaces, such keys acteffectively as separators to cut'o communication between adjoining ductsat the joints of the conduit-sections, and particularly to prevent thepassage of an arc through the joints from one duct to another. Toaccomplish this result most effectively, the keys should be used in allthe keyspaces, as shown in Fig. 6, so as to separate all the ducts fromone another at the joints.

What I claim isl. A clay conduit-section having a pluralityof d ucts andprovided with partitions separating the d ucts, which are formed of twowalls and an intermediate air-space, substantially as set forth.

2. A clay conduit-section having a plurality of ducts in differenthorizontal and vertical planes and provided with partitions Separatingthe ducts composed of two Walls and an intermediate air-space, and anadditional longitudinal opening at the intersection of crossingpartitions, substantially as set forth.

3. The combination with adjoining claj7 conduit-sections havingintermediate oblong spaces in the partitions separating the ducts, of akey oblong in cross-section entering these spaces in the adjoiningsections for maintaining the alinement of the sections, substantially asset forth.

t. The combination with adjoining clay conduit-sections having aplurality of ducts located at different horizontal and vertical planesand provided with intermediate oblong spaces in the vertical andhorizontal partitions scparating the d ucts, of keys oblong incross-section inserted both in the horizontaland verticalpartition-spaces, substan tially as set forth.

5. The combination with adjoining clay conduit-sections having oblongkey-spaces in their ends, of alining-keys of oblon g crosssec tion madeof insulating material, substantially as set forth.

6. The combination with adjoining clay conduit-sections having aplurality of ducts -and oblongr spaces in the partitions separating theducts extending the entire length of such partitions, of separatorsinserted in these spaces and crossing the joints between sections to cutoif communication between the ducts at the joints, substantially as setforth.

7. A clay conduit-section, having a plurality of ducts and provided withpartitions separating the ducts, such partitions having a thicknessdouble that of the outside Walls of the conduit-section, substantiallyasset forth.

S. A clay conduit-section, having a plurality of ducts and provided withhollow partitions separating the ducts, such partitions having athick-ness double that of the outside waiis of the cond uit-section,substantially as set forth.

This specification signed and witnessed this 9th day of December, 1901.

VERNON Il. YARNALL. iVitnesses:

J No. Roinr. TAYLOR, JN0. Louis Lo'rson.

